help/garage: 2025 winter holidays exceptions

Author: rkdarst

help/garage.rst

@@ -9,7 +9,9 @@ Scicomp garage
 .. admonition:: Planned disruptions
    :class: important
 
-   * We don't know of any upcoming disruptions to the garage schedule.
+   * From 22 Dec -- 6 Jan, there is essentially no garage support.  We
+     recommend you use chat/issues and some people may reply when they
+     have time.  Some people will make sure the cluster keeps running.
 
 If you need more help than the issue trackers, this is the place to
 be.  It's not just Triton, but all aspects of scientific computing.